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A battery is charged at a potential of `15 V` for `8` hours when the current flowing is `10 A`. The battery on discharge supplies a current of `5 A` for `15` hours. The terminal voltage during discharge is `14 V`. The 'Watt-hour" efficiency of the battery is.

A

`80.5 %`

B

` 82.5%`

C

`80%`

D

`90%`

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